Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
chat xuc » chat huu, cam xuc, chao xu
va chat » van chat, va phat, cao chat
tu sach » thu sach, su sach, te sach
va nang » van nang, da nang, cam nang
vu nang » vuc nang, vu dang, v nang
hieu va » lieu va, hieu qua
vi su » va su, ve su, ki su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((vu nang) or (va nang)) xa hoi. hieu va chat xuc ((van hanh) OR (ban hanh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((vu nang) OR (va nang)) xa hoi. hieu va chat xuc ((van hanh) OR (ban hanh)) vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((vu nang) or (va nang)) xa hoi. hieu va chat xuc ((van hanh) OR (ban hanh)) vi su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((vu nang) or (va nang)) xa hoi. hieu va chat xuc ((van hanh) OR (ban hanh)) vi su triet*.